Improvement in boiler forms



vJ-. S JENNINGS. BOILER FORM.

No. 62,852. v Patented Mar. 12, 1867.

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IMPROVEMENT IN BOILER FORMS.

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TO ALL WHOM IT MAY CONCERN:

I Be it known that I, JOHN S. JENNINGS, of.Medimi-, in the county ofOrleans, andState of New York, have invented a certain new and usefulImprovement in Forms forshaping the Tops of Stove Boilers and I dohereby declare that the following is a full and erect descriptionthereof, reference being had to the accompanying drawings, making partof this specification.

Figlire 1 is a perspective view of the apparatus. I

Figure 2, a longitudinal section of the same, situated in the mouth ofa. boiler.

Figure 3, view of the right and left-hand screw detached.

Like letters of reference indicate corresponding parts in all thefigures.

The object of my'invention isto shape the tops of ordinary oval stoveboilers so that the covers \Ylll Jit accurately. A device is now in usefor that purpose, consisting of acentral block, having hinged at oneend, (so as to turn up or down,) a half circular head, and at the otherend a similar head not hinged, but which is expanded by 'means of asingle-acting screw. The great difficulty with this device is, thatsimply fitting the mouth ofthe boiler, andharingnothing tosustain it, itcannot be easily retained in position, but becomes displaced by theaction of the mallet on the outside. By reason of one end onlyadjusting, the expansion is also irregular and unequal. My inventionconsists in the employment of a flange or rim on the sliding blocks, forholding on the edges of the boiler, with lips for clasping the same; andthe useof a right and left-hand screw for expanding the blocks equally;and dowels or slides for the blocks to move on, thereby insuring anequal expansion and easy action. I)

As represented in the drawings, A A are two blocks, with the outer endsrounded in order to conform to the ordinary oval form of a stove boiler.They are connected at the middle by two dowels or slides, a a, overwhich they move loosely, and also by right and left-hand screws, 6 b,with hand-wheel B, which pass through nuts g g, fixed firmly on the endsof the blocks. The blocks are provided with a projecting rim orfiange,f, at

the top, which rests'upon the edge of the mouth of the boiler, and atproper positions, with lips, d 01, which clasp over the edge, as shownin fig. 2. The rim f, byresting over the top of the boiler, and the lipsd, by

elasping it, always retain the device in place against the action of themallet'in shaping the boiler. In the arrangement before alluded to thereis nothing to retain the device, but it must he held by one hand of theoperator, and even then the jar will displace it. The right andleft-hand screw expands both heads equally, The dowels a a allow eachhead to slide freely, but still retain both securely in place.. By thisarrangement but two principal parts, A A, instead of three, as in theother, are required.

What I claim as my in vention, and desire to secure by Letters Patent,155- p The rimf and lips iL'the doublea-cting screw 6 b, and the dowelsa a, when combined with the two heads A A, the whole arranged andoperating as herein set forth.

; JOHN S. JENNINGS.

Witnesses:

KELLOGG LB. FmLEy, WM. F. Hon'rou.

